[INFO] fetching crate platform-num 0.1.0-aplha.1...
[INFO] testing platform-num-0.1.0-aplha.1 against 1.90.0 for beta-1.91-3
[INFO] extracting crate platform-num 0.1.0-aplha.1 into /workspace/builds/worker-2-tc1/source
[INFO] started tweaking crates.io crate platform-num 0.1.0-aplha.1
[INFO] finished tweaking crates.io crate platform-num 0.1.0-aplha.1
[INFO] tweaked toml for crates.io crate platform-num 0.1.0-aplha.1 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate platform-num 0.1.0-aplha.1 on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 2 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e1840c036c67acabd7aec6262f0faf105163bcee3b800538dd71ac729f35a61e
[INFO] running `Command { std: "docker" "start" "-a" "e1840c036c67acabd7aec6262f0faf105163bcee3b800538dd71ac729f35a61e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e1840c036c67acabd7aec6262f0faf105163bcee3b800538dd71ac729f35a61e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e1840c036c67acabd7aec6262f0faf105163bcee3b800538dd71ac729f35a61e", kill_on_drop: false }`
[INFO] [stdout] e1840c036c67acabd7aec6262f0faf105163bcee3b800538dd71ac729f35a61e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e1ca5833a083318defd1576499682190ca8b442d4eff4c81fcd8def7a27e89c4
[INFO] running `Command { std: "docker" "start" "-a" "e1ca5833a083318defd1576499682190ca8b442d4eff4c81fcd8def7a27e89c4", kill_on_drop: false }`
[INFO] [stderr]    Compiling platform-num v0.1.0-aplha.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(step_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(trait_alias)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `platform-num` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "e1ca5833a083318defd1576499682190ca8b442d4eff4c81fcd8def7a27e89c4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e1ca5833a083318defd1576499682190ca8b442d4eff4c81fcd8def7a27e89c4", kill_on_drop: false }`
[INFO] [stdout] e1ca5833a083318defd1576499682190ca8b442d4eff4c81fcd8def7a27e89c4